Explore the history and physical details of our planet--including the atmospheric layers, the plates underground, and the solar system--in this engaging nonfict

A cactus wren nests in a desert cactus. A zebra grazes on a grassy plain. A cougar crouches between thick trees in a forest. Deserts, grasslands, and forests ar

Ancient Polynesians were some of the best navigators in history. They sailed double-hulled outrigger canoes across great distances and settled in all the major

The way we live affects our home - Earth. While people have lived on Earth for a long time, we are just beginning to see the impact of our actions on our planet

How did sailors long ago know how to get from here to there? They needed smarts, bravery, and tools of navigation! Many of the tools used then are still used in